Induction coil



Nov. 1 3 .1923.

'qegfi. 4 9

. I m l P 711'1 INVENTOR. BY

i ATTORNEY.

Patented Nov. 13, 1923.

UNITED STATES 1,414,152 PATENT OFFICE.

ARTHUR AWATER KENT, OI" ABDIORE, PENNSYILVA'NIA INDUCTION COIL.

Application filed Ianuary B, 1921. Serial No. 435,792.

To all whom it may concern Be it known that I, ARTHUR ATWATER KENT, a citizen of the United States, residing in Ardmore, .county of Montgomery.

Stand State of Pennsylvania, have invented certain new and useful- Improvements in Induction Coils, of which the following is a inafter described and claimed. For an illustration of one of the various forms my invention may take, reference is to be had to the accompanying drawing, in which:

Fig. 1 is a. vertical sectional view through an induction coil embodying my invention. Fig. 2 is a horizontal sectional view taken on the-line 2-2 .of Fig. 1.

Fig. 3 is a fragmentary side elevational view of the structure shown in Fig. 1.

Fig. 4 is a circuit diagram.

Referring to Figsml, 2 and 3, C is the inner core composed of numerous iron wires confined within the spool or wrapping a. of insulating material. Within the lower end of the member a is a mass b-of insulating- .material- The secondary coil or, winding S comprising alternate layers of paper d and layers of fine wire e may be wound upon the member a, or may be wound separately as a unit; and then slippedover the tube a to the posi' tion indicated. Masses of asphalt or equivalent insulating material maybe applied'to the ends of the secondary umt S, whereby theasphalt percolates to some extent between the layers of paper d; it being underserves to bind the ends 0 stood that the layers of the secondary. conductor e do not extend the full length of the secondary unit. The as halti'c material the paper to gether. V V

Insulated from and surrounding the secondary coil S .is the primary coil P, which may be separately wound and slipped upon the secondary S or may be wound as a structural unit with and upon the secondary S. Around the primary P is disposed a wrapping or layer of insulating material is.

The' induction coil structure comprising the core C and the primary and secondary coils rests upon the washer c, of mica or other suitable material, which in turn rests upon the washers or disks of insulating material 9 and k, the latter restin upon the metal bottom 'i of the casing H, which is preferably of metal, as tinned iron or other suitable material. I

After the core, primary and secondary coils and parts I), c, g and h are brought into their relative positions indicated, asphaltic or other insulating material 7', preferably in 'fluid state, is a plied, and upon,cooling sets or h'ardens. "l he structure with the ap-' plied material 7' is then introduced into the casing H to the position indicated.

Between the coil structures, that 'is,b e-

tween the outer insulating sheet is and the -inner wall of the metal tube or casing H,

are inserted the additional or outer core' wires E, preferably in heat transfer contact with the metal tube or casing H:

The inner core C will Be observed to materially longer than either of the primary.

or secondary'windings, and in the example illustrated, at its upper end extends materially above the upper end of the casing H.

The casing .11 may be of any suitable structure. In the example illustrated, its

is formed into a channel n into which extends the lower edge of the tube H, the bottom 2' being secured by presslng, rolling welding or otherwise to the tube I'I, an

soldered or welded to flange g of base member "0. The base member 0, having apertures p to receive screws or other fastening means, has the upstanding flange g. Throu h the o ening' surrounded by the flange q t e tube is inserted, upwardly as viewed in Fig. 1, the channel structure 1 of the bottom 6 being oftoo large atlia-meter to pass through said opening, al'uljtherebyv coming into engagement with the inner end of the flange as indicated. The bottom 11 is then bottom 11 has the upstanding flange m, which soldere welded or otherwise secured-to the "nae- 0 I The casing" H is closed by a cap member lic A, preferably of molded insulating material, as condensation product, the cap having the integral flange r fitting into the tube in the bottom t ereof, in register with a nected to the rimary coil P. As indicated d 3,'the capmA extends a con lug z of the cap .ylace similar hole in' the cap A, the conductor 1) being held in any suitable way, as for example, by the inserted plug w. The outer end of the secondary S may be connected to the inner end of the primary P, which is connected by conductor m with the metallic insert 3 molded in the boss or upstanding A, the conductor :12 extending through a ole in the flange r and into a hole extending through the insert 3 and then soldered or otherwise secured thereto at 1. Similarly, the outer end of the primary 1 is connectedby conductor 1) to a second insert 0 in a second boss (1 Into the inserts y and 0* are threaded the binding screws 6 and f by, which conductors of the primary circuit of the-induction coil are conin Figs. 1 an siderable distance over t edge of the easing H, and the inserts y and c are, without sacrifice of compactness of structure, suitabl .widely separated, particularly from the big tension terminal or insert u. 7

Within the cap A is the deep recess or cavity 9 of depth and, diameter suitable to receive the upper end of the inner core which, as aforesaid, projects beyond the easing n lacing the cap 1n position, there 1s therein or over the end of the core and adjacent core structure a mass of asphalt or uivalent material b and as the cap is pl in its final position, this insulating material flows into all cavities and recesses affording high insulation and also afl'ording mechanical binding and support. Referring to Fi 4, there is Shown a circuit arrangement 1n which the structure described may be employed.

One terminal of the battery B, as a storage battery, or other source of current, is connected to the frame of the motor vehicle or other apparatus with which used, such connection bei indicated by ground at i The other terminal of the battery B is con: nected through switch r to either terminal of the primary P: that is, to either the insert 3 or insert a. In the example illustrated,

' the battery is shown as .(onected to the insert 3 to which is also connected the outer terminal of the secondary S. The other terminal of the rimary P connecting with the insert or bin ing post 0 connects with the stationary contact 1' of the timer or interrupter, whose movable contact is indicated at k, and as grounded at i. 1 The movablef .rotary distributor 0 rotating in synchronism with the cam m and coming sue-- eessively into high tension current transfer relation with the stationary. distributor contacts 2 each connected with a spark plug 9 1 By the structure described, it will be apparent that both the primary and secondary windings. may be completely insulated or ungrounded' Thus, neither primary nor seconda winding is connected to the metal casin which generally is secured to the meta or conducting frame of the apparatus with which emplo ed. The two terminals of the secondary casing H and from each other and carried by the cap A. Similarly, both terminals of the 1pirimary P are insulated from the cas ng. and from eachother. and carried by the cap A, one of the cap-terminals being common to both primary and secondary windings.

The inner core C is completely insulated, though it will be understood that there may be a connection thereto from the secondary S, and particularly from the end of the secondary S. f

As well understood in the art,---the primary and secondary windings are preferably impre ated with insulating material by the usua vacuum process.

are insulated from the When the high tension secondary coil is adjacent to the core C, as illustrated, and there is no potential equalizing connection tween the core C and the secondary, that is, when the core C remains completely insulated, it too maybe subjected to the wow um impregnation process, whereby substan t-iallf all the air is removed and replaced by insu ting material. Under these circumstances, notwithstanding complete isolation,

rial is chosen merely because of cheapness, the function of the casing being merely protection and waterproofing for the structure contained therein, and for transmitting. to the surrounding atmosphere heat imparted thereto from the structure within it.

It further will be noted that the inserts u, y and c in the cap A do not extend entirely through the cap to the lower surface thereof, a substantial thickness of the cap material intervening.

What I claim is:

1. An induction coil comprising a mag netizable core, a secondarywinding surrounding said 'core and insulated therefrom, a primary winding surrounding said secondary winding, a metallic enclosing casing insulated from said windings and from said core, a cap of insulating material closing said casing, a secondary terminal carried by said cap and connected to one end of said secondary winding, and two primary terminals carried. by said cap, oneof said primary terminals connected with the other end of said secondary winding.

2. An induction coil comprising a magnetizable core, a secondary winding surrounding said core, a primary winding surrounding said secondary winding, an enclosing casing, a connection from the outer end of said secondary winding to said primary winding, a cap of insulating material closing said casing, a pair of primary terminals on said cap, and a secondary terminal on said cap connected to the inner terminal of said secondary winding.

3. An induction coil comprising a magnetizable core, a secondary winding surrounding said core, a primary winding surrounding said secondary winding, a metal- 6. An induction coil comprising primary and secondary windings and a core therefor, a casing, said core extending'materially beyond one end of said casing, a cap of insulating material having a recess receiving said core and closing said end of said casing, and a filling of insulating material in said recess surrounding said core and intervening tween its core and said cap.

7. An induction coil comprising-primary and seconda windings and a core therefor, a metallic casing insulated from said windings and from said core,a cap of insulating material closing one end of said casing and having a central recess into which said core extends, a central secondary lc enclosing casing insulated from said windings, a connection from the outer end of said secondary winding to said primary winding, a cap of insulating material 0105- ing said casing, a pair of primary terminals on said cap, and a secondary terminal on said cap connected to the inner terminal of said secondary winding.

4. An induction coil comprising primary and secondary windings and a core therefor, a casing, said core extending materially beyond one end of said casing, a cap of insulating material having a central recess receiving said core and closing said end of said casing, and a secondary terminal at substantiallv the center of said cap connected to one end of said secondary winding.

and secondary windings and a core therefor, a casing, a cap of insulating material closlng one end of said casing'and having primary terminals-on said cap terminal on said cap in alignment with said recess and core, a connection from one end of the secondary winding to said secondary terminal, primary terminals on said. cap,

and a connection from the other endfi od said secondary windlng to one of said-p mary terminals.

8. An induction coil comprising primary and secondary windings and a core there for, a casing, said core extending beyond one end of said casing, a cap of insulating 'material having a central recess receiving said core and closing said end of said casing, said cap having a central secondary terminal adjacent one end of said recess, and. on opposite sides of said end of said core.

9. An induction coil comprising a core, primary and secondary windings, a casing enclosing said core and windings, a cap of insulating material closing one end of said casing, a secondary terminal insert molded in said cap adjacent the center thereoii and connected to the innerjerminal of said sec.

ondary winding, and primary terminal 1nn serts molded in said cap adjacent the edges of said cap on opposite sides of said secondary terminal insert.

- '10. An induction coil comprising a 'core, primary and secondary windings, a casing enclosing the same, a molded cap of insulating material closing one end of said casing,

lateral bossesonrsaid cap adjacent the edge thereof, primary terminal inserts molded in -"-said bosses, a central boss on said cap proa recess into which said core 'extendsyanda filling of insulating material in said recess surrounding said core and intervening between its end and said cap. 1

jecting above said first named bosses, and a secondary terminal insert molded in said central boss.

11; An induction coil comprising a core and primary and secondary windings, a

tubular casing enclosing the same, a molded 5. An induction coil comprising primary caprof insulating material closing one end of said casing and projecting over the end T of said'c'asing, anda primary terminal insert molded in said cap and dis osed over and projecting laterally outwar ly be end.

the end of said casing, material of sai cap intervening between the end of said casing and said insert. a

12. An-induction coil comprising a core and primary and Secondary windiings, a tubular metal casing enclosing the same, a molded cap of insulating material having a circumferentially extending flange fitting into and closing the end of said casing, a terminal insert molded in said cap above said flange, and a connection from one of said windings extending throu h said fiange and into said insert.

13. An induction coil comprisin a core and primary and secondary windings, a metallic tube enclosing the same, a metallic base member having an opening, an upstanding flange on said base member forming a wall of said opening, and a bottom for said tube secured thereto and extending laterally beyond the end of said tube, said tube extended through said opening and i beyond said flange to position in which said bottom engages said base member.

' 14. An induction coil comprising a magnetizable core, a secondary winding surrounding said core, a primary winding surround'ng said secondary winding, an enclosing casing, a conducting base on said casing, said core and secondary winding insulated from each'other and from said base,

a cap of insulating material closing the other end of said casing, a secondary terminal on i said cap connected with one end of said secondary winding, and primary terminals on I said cap, one of said primary terminals connected to the other end of said secondary winding. v

15. An induction coil comprising a core and primary and secondary windings, a metallic tube enclosing the same, said core and said windings insulated from said tube,

a molded cap of insulating material closing one end of said tube, said cap having a re-- cess into which said core extends, said secondary winding being ad acent said core, a secondary terminal carried on sald cap above said core andconnected to the inner terminal of said secondary winding, and primary terminals carried by said cap.

16. An induction coil comprising a core and primary and secondary windings, a

metallic tube enclosing the same, said core and said windings insulated from said tube, a molded cap of insulating material closing one end of saidtube, said cap havin a recess into which said core extends, said sec- '65 ondarwindin bein adjacent said core a p V g g core and windings, a molded cap of insulating material enclosing the end of said casing, a secondary terminal carried by said cap and connected to the inner end of said secondary winding, primary terminals carried by said cap, and a connection from one of said primary terminals to the outer end of said secondary winding and to the inner end of said primary winding.

18. An induction coil comprising a metallic tubular casing, a core and primary and secondary windings within said casing and insulated therefrom, a cap of insulating material closing one end of said casing, the secondary winding being adjacent said core and the primary winding surrounding said secondary winding, primary and secondary terminals carried by said cap, one of said terminalsconnected'to the outer end of said secondary winding and to the inner end of said primary winding.

19. An induction coil comprising a core and primary and secondary windings thereon, a metallic casing therefor insulated from said core and said windings, a cap of insulating material" closing one end of said casing and having a central recess into which said core extends, a secondary terminal on said cap in alignment with said recess and said core and connected to one end of said secondary winding, primary terminals on said cap adjacent the outer edge thereof, said primary windings surrounding said secondary winding, one terminal of said primary winding connected to one of said primary terminals, and a connection from the other primary terminal to the other ends of said secondary and primary windings.

20. An inductioncoil comprising a core and primary and secondary windings thereon, said primary winding surrounding said secondary winding, a metallic casing enclosing said core and windings and insulated from said windings, aca-p of insulating material closing one end of said casing and having a cgntral recess, a secondary terminal on said cap disposed centrally thereof in alignment with said recess and core, a con-' ne'ction from the inner end of said secondary winding to said terminal, primary terminals on said cap, a connection from the outer end mary terminals, and a connectionfrom the outer end of said secqndaryand the inner end of said primary to another of said pri- -mary terminals.

' 21. An induction coil comprising a pore and primarv and secondary windings t hera' on, a metallic tubular enclosing casing in- 'sulated from said windings, a cap of insulating material closing one end of said casing,

means directly securing said cap to said casing, said secondary winding lyin adjacent said core and surrounded by sai primary winding, a secondarykterminal on said cap of said primary winding to one of said prifrom t minals, and a connection from the outer endof said primary winding to the other primary terminal.

22. An induction coil comprising a core, a secondary winding surrounding said core adjacent thereto, a primary winding surrounding said secondary winding, a metallic tubular casin enclosing said core and windings and insu ated from said windings, a cap of insulating material closing one end'of said casing and having a recess into which said core extends, a secondary terminal carried by'said cap in alignment with said recess and said core, a lead from the inner lay-- er of said secondary winding to said secondary terminal, insulating material overlying said lead alongthe end of said core disposed in said recess, primary terminals carried by said ca beside said recess, and a connection iie outer end of said secondary winding to one of said primary terminals and separated from said secondary lead by said insulating material.

23. An induction coil comprising a core consisting of subdivided magnetizable material impregnated with insulating material, a secondary Winding surrounding said core adjacent thereto, and a primary winding surrounding said secondary winding.

24. An induction coil comprising inner and outer magnetizable cores, primary and secondary windings disposed around said inner core between it and said outer core, the secondary winding surrounded by the primary winding, a casing enclosing said cores and windings, a cap of insulating material closing one end of said casing, said inner core extending longitudinally beyond said outer core and'into said cap, an primary and secondary terminals carried by said cap.

'25. An induction coil comprising inner and outer magnetizable cores, prima and secondary windings disposed aroun said inner core between it and said outer core, the secondaryxfwinding surrounded by the primary winding, a casing enclosing said cores and windings, and a cap of insulatin material closing one end of said casing an having a recess, said inner core extendin longitudinally beyond said outer core an into said'recess.

ondary winding comprising layers of con-- ductor separated by sheets of insulating material, said sheets extending longitudinally beyond said conductor layers, and a cap of insulating material closing one end of said casing and having a recess into which extend said core and said sheets of insulating material.

27. An induction coilcomprising a casing, a core therein, primary and secondary wind- .ings upon said core, one of said windings comprising layers of conductor separated" by sheets of insulating material, said sheets of 1 insulating material extending longitudinally beyond said conductor layers, and a cap closing one end of said casing and into whiizh said sheets of insulating material exten 28. An induction coil comprising a casing, a core therein, primary and secondary windings upon said core, one of said windings comprising layers of conductor separated by sheets of insulating material, said sheets extending longitudinally beyond said conductor layers, someof.said sheets adjacent said core having greater longitudinal' extent than sheets more remote from said core, and a cap closing one end of said casing and into which said sheets of greater length extend.

29. An induction coil comprising a casing, a core therein, primary and seconds.

windings upon said core, one of said win ing said secondary winding, an enclosing cas ing, a cap of insulating material closing one end of said casing, a secondary terminal and primary terminals, carried by said cap, a connection from the inner end of said secondary winding to said secondary terminal on said cap, a connection from the other end of the secondary to one of said primary terminals, and an insulating filler confined by said cap and embedding said first named connection.

31. An induction coil comprising a core, primary and secondary windings thereon, an enclosing casing, a cap of insulatin material forming an eiid closure for sai casing and into which the end of said core extends in spaced relation thereto, a secondary terminal carried by said cap and having a connection tovone terminal of said secondary winding, and an insulatin filler disposed in said cap and embedding the end tion. 1

32. An induction coil comprising a core, primary and secondary windings thereon,

.of said core and surrounding said connec a metallic enclosing casing, said core inand an insulating filler between said cap and sulated from said casing, acap of insulating said windings and embedding said first 1 material forming an end closure for said named connection.

casing, a. secondary terminal on said cap, a In testimony whereof I have hereunto connection from one end of said secondary aflixed my signature this 23rd day of Decemwinding to said terminal, primary terminals ber, 1920.

on said cap, a connection from one of them to the other end of said secondary winding, ARTHUR ATVVATER KENT. 

